Why Oklahoma Is Seeing More Earthquakes

Lately, Oklahomans are as wary of earthquakes as tornadoes.

— -- Lately, Oklahomans are as wary of earthquakes as tornadoes.

The United States Geological Survey recorded 1,010 earthquakes of a magnitude 3.0 or greater in the region last year, a nearly three-fold increase from the 318 temblors of this magnitude in 2009. Oklahoma alone felt 619 quakes of a magnitude 2.8 or larger from January through June of this year.

Last month, the Oklahoma Geological Survey began a six-month study of oil and gas injection wells to better understand quakes triggered by this technique, Public Radio Tulsa reported.

The latest quake happened at 7:02 a.m. local time in north-central Oklahoma and was felt in other parts of the Midwest, from Nebraska to north Texas. Its epicenter was about 9 miles northwest of the town of Pawnee and some 73 miles northeast of Oklahoma City.

Police in Pawnee said windows were shattered and the facades of some brick buildings were damaged.

ABC News’ Matthew Fuhrman and Matt Foster contributed to this report. The Associated Press also contributed to this report.